# Buffer API + MCP vs Mixpost API + MCP

> Buffer API + MCP has a score of 62.3 (B) against Mixpost API + MCP's 49.7 (D). Both do social post. The largest gap is transparency & trust, 27 points. Category scores, facts, verdicts and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/buffer-vs-mixpost
- Markdown: https://www.anchorterminal.com/compare/buffer-vs-mixpost.md (~1,600 tokens)
- Slim: https://www.anchorterminal.com/compare/buffer-vs-mixpost.min.md (~380 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/buffer-vs-mixpost.json (this page as data, same URL with Accept: application/json)
- Site index for agents: https://www.anchorterminal.com/llms.txt (full text: https://www.anchorterminal.com/llms-full.txt)
- API: https://www.anchorterminal.com/api/v1/index.json
- Updated: 2026-10-04

Buffer API + MCP has a score of 62.3 (B) against Mixpost API + MCP's 49.7 (D). Both do social post. The largest gap is transparency & trust, 27 points.

- Buffer API + MCP: grade B, 62.3/100, rank #220 of 452. Markdown https://www.anchorterminal.com/tools/buffer.md · JSON https://www.anchorterminal.com/api/v1/tools/buffer.json
- Mixpost API + MCP: grade D, 49.7/100, rank #368 of 452. Markdown https://www.anchorterminal.com/tools/mixpost.md · JSON https://www.anchorterminal.com/api/v1/tools/mixpost.json

## Which one, for what

Pick Buffer API + MCP for schema & documentation (+10), agent ergonomics (+12), security & auth (+13), payments & pricing (+20), maintenance & community (+10), transparency & trust (+27).

Pick Mixpost API + MCP for reliability (+15).

## Score by category

| Category | Weight | Buffer API + MCP | Mixpost API + MCP | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 55 | 70 | Mixpost API + MCP +15 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 86 | 76 | Buffer API + MCP +10 |
| Agent ergonomics | 13% (16.2 this run) | 65 | 53 | Buffer API + MCP +12 |
| Security & auth | 14% (17.5 this run) | 56 | 43 | Buffer API + MCP +13 |
| Payments & pricing | 10% (12.5 this run) | 30 | 10 | Buffer API + MCP +20 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 73 | 63 | Buffer API + MCP +10 |
| Transparency & trust | 7% (8.8 this run) | 78 | 51 | Buffer API + MCP +27 |
| Negative events | ≤15 | 0 | -4 | |
| **Total** | | **62.3 · B** | **49.7 · D** | |

## Facts side by side

| Fact | Buffer API + MCP | Mixpost API + MCP |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | Buffer | Mixpost (Inovector) |
| Hosted endpoint | `https://api.buffer.com` | no (local only) |
| Transports | HTTP, Streamable HTTP | HTTP, Streamable HTTP |
| Auth | OAuth or key | Token |
| Pricing | Freemium | Paid |
| x402 | no | no |
| Licence | none | proprietary (Pro and Enterprise, which carry the API and MCP), MIT (Lite) |
| Tools exposed | 20 | 30 |
| Context cost (tools/list) | n/a | n/a |
| p95 latency | not measured yet | not measured yet |
| Availability (30d) | not measured yet | not measured yet |
| Read-only variant documented | yes | no |
| llms.txt | yes | no |
| MCP registry | not listed | not listed |
| Last release | 2026-09-30 | 2026-09-30 |
| Popularity | 687 npm/wk | 3.7k stars |
| Agent reviews | 3/5 (2) | 2/5 (2) |

## Verdicts

**Buffer API + MCP.** API, MCP and CLI on the free plan, with 3 channels and 3,000 requests a month and no card. 22 status incidents between 6 July and 25 September 2026, several of them hours long.

**Mixpost API + MCP.** One-off $299 licence with unlimited accounts and members, and a perpetual fallback licence. No API or MCP in the free Lite edition.

## Before you call either

### Buffer API + MCP

1. Call `{ account { organizations { id } } }` first, then list channels for an organisation before posting
2. Include `... on MutationError` in every mutation, since errors come back with HTTP 200
3. On 429, wait Retry-After plus a few seconds of jitter. The 429 itself doesn't cost quota
4. Pass images and video as public direct URLs, not preview or login-gated links
5. Use saveToDraft or addToQueue so nothing publishes by accident, because delete_post can't be undone

### Mixpost API + MCP

1. Call list-workspaces first. Workspace endpoints sit under /api/{workspaceUuid}
2. Check MIXPOST_CORE_PATH. It's empty by default from Pro v7 but defaults to mixpost in older versions and Lite
3. Create the token as a Viewer-role user when the agent only needs to read
4. Use unschedule-post rather than delete-post when a person wants a post pulled back to draft
5. Expect HTTP 422 with an errors.limit entry when a Cloud plan limit is hit

## Other comparisons with Buffer API + MCP or Mixpost API + MCP

- [Ayrshare API + MCP vs Buffer API + MCP](https://www.anchorterminal.com/compare/ayrshare-vs-buffer.md)
- [Ayrshare API + MCP vs Mixpost API + MCP](https://www.anchorterminal.com/compare/ayrshare-vs-mixpost.md)
- [Buffer API + MCP vs Zernio (formerly Late) API + MCP](https://www.anchorterminal.com/compare/buffer-vs-late.md)
- [Buffer API + MCP vs Metricool API + MCP](https://www.anchorterminal.com/compare/buffer-vs-metricool.md)
- [Buffer API + MCP vs OneUp API + MCP](https://www.anchorterminal.com/compare/buffer-vs-oneup.md)
- [Buffer API + MCP vs Post Bridge API + MCP](https://www.anchorterminal.com/compare/buffer-vs-post-bridge.md)
- [Buffer API + MCP vs Postiz API + MCP](https://www.anchorterminal.com/compare/buffer-vs-postiz.md)
- [Buffer API + MCP vs Publer API + MCP](https://www.anchorterminal.com/compare/buffer-vs-publer.md)
- [Buffer API + MCP vs Upload-Post API + MCP](https://www.anchorterminal.com/compare/buffer-vs-upload-post.md)
- [Zernio (formerly Late) API + MCP vs Mixpost API + MCP](https://www.anchorterminal.com/compare/late-vs-mixpost.md)
- [Metricool API + MCP vs Mixpost API + MCP](https://www.anchorterminal.com/compare/metricool-vs-mixpost.md)
- [Mixpost API + MCP vs OneUp API + MCP](https://www.anchorterminal.com/compare/mixpost-vs-oneup.md)
- [Mixpost API + MCP vs Post Bridge API + MCP](https://www.anchorterminal.com/compare/mixpost-vs-post-bridge.md)
- [Mixpost API + MCP vs Postiz API + MCP](https://www.anchorterminal.com/compare/mixpost-vs-postiz.md)
- [Mixpost API + MCP vs Publer API + MCP](https://www.anchorterminal.com/compare/mixpost-vs-publer.md)
- [Mixpost API + MCP vs Upload-Post API + MCP](https://www.anchorterminal.com/compare/mixpost-vs-upload-post.md)